US20230194921A1 - Backlight module of display device - Google Patents
Backlight module of display device Download PDFInfo
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- US20230194921A1 US20230194921A1 US17/662,843 US202217662843A US2023194921A1 US 20230194921 A1 US20230194921 A1 US 20230194921A1 US 202217662843 A US202217662843 A US 202217662843A US 2023194921 A1 US2023194921 A1 US 2023194921A1
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- prismatic
- diffuser
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- substrate
- backlight module
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Definitions
- the present disclosure relates to a backlight module of a display device. More particularly, the present disclosure relates to the backlight module of the display device with ink structures printed at certain locations of a diffuser.
- the amount of light-emitting diodes (LED) in the backlight modules may be increased to improve luminance coverages, such that the dark spots not overlapped by the light energies can be solved.
- the materials of the diffusers in the backlight modules may be modified to enhance the secondary diffusions of lights emitted by the light-emitting diodes.
- mini LEDs as the light sources to increase light intensities.
- mini LED package structures do not include secondary optical lens to spread the emitted lights. Therefore, new light diffusion technique is required to improve the light distributions of such backlight modules.
- Some embodiments of the present disclosure provide a backlight module of a display including a carrier, a plurality of light-emitting diode chips and a first diffuser.
- the light-emitting diode chips are arranged on the carrier.
- the first diffuser is over the carrier and the light-emitting diode chips.
- the first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures.
- the first substrate has an upper surface distal from the carrier.
- the first prismatic structure is at the upper surface of the first substrate.
- the first prismatic structure includes a first prism sub-structure and a second prism sub-structure, and the first prism sub-structure, the second prism sub-structure and the upper surface of the first substrate together define a gap.
- the first ink structures are in the gap and are in contact with the upper surface of the first substrate.
- the first prism sub-structure of the first prismatic structure has a first vertex protruding from the first substrate and a plurality of second vertices in contact with the upper surface of the first substrate, and the first ink structures are adjacent to at least one of the second vertices.
- the first prismatic structure further comprises a third prism sub-structure, a V-shaped recess is formed between the third prism sub-structure and the first prism sub-structure, and the third prism sub-structure and the first prism sub-structure are symmetrical with the V-shaped recess.
- the first ink structures are not in the V-shaped recess.
- the first prismatic structure has a plurality of surfaces inclined with respect to the upper surface of the first substrate, and the first ink structures are not on the surfaces.
- the backlight module further comprises a second diffuser over the first diffuser.
- the second diffuser comprises a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser.
- the first prism sub-structure and the second prism sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prism sub-structure and the second prism sub-structure respectively.
- the second diffuser further includes a second prismatic structure
- the second prismatic structure includes a plurality of fourth prism sub-structures arranged at an upper surface of the second substrate, the upper surface of the second substrate is distal from the first diffuser.
- Each of the fourth prism sub-structures includes a third vertex protruding from the upper surface of the second substrate and a plurality of fourth vertices in contact with the upper surface of the second substrate.
- a size of the first prism sub-structure of the first diffuser is larger than a size of any of the fourth prism sub-structures of the second diffuser.
- the first diffuser further includes a supporting structure on the upper surface of the first substrate and adjacent to the first prismatic structure, and a height of the supporting structure is greater than that of the first prismatic structure.
- a first weight percentage of TiO 2 in the first ink structures in the gap of the first diffuser is lower than a second weight percentage of TiO 2 in the second ink structures at the bottom surface of the second substrate.
- the backlight module further includes a wavelength conversion film over the first diffuser and an optical film over the wavelength conversion film.
- Some embodiments of the present disclosure provide a display device including a display panel, a back plate and a backlight module accommodated in a space formed by the display panel and the back plate.
- the backlight module includes a carrier, a plurality of light-emitting diode chips arranged on the carrier and a first diffuser over the carrier and the light-emitting diode chips.
- the first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures.
- the first substrate has an upper surface distal from the carrier.
- the first prismatic structure is at the upper surface of the first substrate, and the first prismatic structure includes a first prismatic sub-structure and a second prismatic sub-structure, and the first prismatic sub-structure, the second prismatic sub-structure and the upper surface of the first substrate together define a gap.
- the first ink structures are in the gap and in contact with the upper surface of the first substrate.
- the display device further includes a second diffuser over the first diffuser, and the second diffuser includes a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser.
- the first prismatic sub-structure and the second prismatic sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prismatic sub-structure and the second prismatic sub-structure respectively.
- the first ink structures include rutile TiO 2 , anatase TiO 2 or combinations thereof.
- the first prismatic structure has a plurality of surfaces inclined with respect to the upper surface of the first substrate, and the first ink structures are not on the surfaces.
- the first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures.
- the first substrate has an upper surface.
- the first prismatic structure is at the upper surface of the first substrate, and the first prismatic structure includes a first prismatic sub-structure and a second prismatic sub-structure, and the first prismatic sub-structure, the second prismatic sub-structure and the upper surface of the first substrate together define a gap.
- the first ink structures are in the gap and in contact with the upper surface of the first substrate.
- the diffuser set further includes a second diffuser over the first diffuser.
- the second diffuser includes a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser.
- the first prismatic sub-structure and the second prismatic sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prismatic sub-structure and the second prismatic sub-structure respectively.
- a first weight percentage of TiO 2 in the first ink structures in the gap of the first diffuser is lower than a second weight percentage of TiO 2 in the second ink structures at the bottom surface of the second substrate.
- the first prismatic structure of the first diffuser and the second diffuser are kept in a distance.
- the first ink structures comprise rutile TiO 2 , anatase TiO 2 or combinations thereof.
- the ink structures on the diffuser are printed at certain locations to reach better effect of light mixing. Therefore, uniformity of images of the display is improved. Moreover, the usage of light-emitting diode chips in the display may also be reduced.
- FIG. 1 illustrates a side view of a backlight module of a display in some embodiments of the present disclosure.
- FIG. 2 illustrates an exploded view of the carrier, the light-emitting diode chips, the reflector and the first diffuser of the backlight module of the display in some embodiments of the present disclosure.
- FIG. 3 illustrates a perspective view of the first diffuser in some embodiments of the present disclosure.
- FIG. 4 illustrates a top view of the first diffuser in some embodiments of the present disclosure.
- FIG. 5 illustrates the cross-section view of the first prismatic structure taken along line A-A in FIG. 4 .
- FIG. 6 illustrates the cross-section view of the first prismatic structure taken along line B-B in FIG. 4 .
- FIG. 7 illustrates a side view of a backlight module of the display in some embodiments of the present disclosure.
- FIG. 8 illustrates an exploded view of the carrier, the light-emitting diode chips, the reflector, the first diffuser and the second diffuser of the backlight module of the display in some embodiments of the present disclosure.
- FIG. 9 illustrates a perspective view of the second diffuser in some embodiments of the present disclosure.
- FIG. 10 illustrates a top view of the second diffuser in some embodiments of the present disclosure.
- FIG. 11 illustrates a bottom view of the second diffuser in some embodiments of the present disclosure.
- FIG. 12 illustrates the cross-section view of the first prismatic structure taken along line C-C in FIG. 10 .
- FIG. 13 illustrates the cross-section view of the first prismatic structure taken along line D-D in FIG. 10 .
- FIG. 14 A illustrates the relative position of the first diffuser and the second diffuser.
- FIGS. 14 B- 14 D illustrate the paths of light of the light-emitting diode chips in the backlight module of the display.
- FIG. 15 A illustrates the uniformity distribution of the backlight module of the display in prior arts.
- FIG. 15 B illustrates the uniformity distribution of the backlight module of the display in some embodiments of the present disclosure.
- a display device in some embodiments of the present disclosure includes a backlight module with a diffuser having ink structures.
- the ink structures are printed at certain locations on the diffuser to provide better light mixing effect. Therefore, luminance uniformity of images displayed by the display device can be improved. Moreover, the amount of light-emitting diode chips in the backlight modules of the display devices may also be reduced.
- FIG. 1 illustrates a side view of a backlight module 100 of the display device in some embodiments of the present disclosure, and the backlight module 100 of the display device is accommodated in a space formed by a display panel and a back plate or a frame, which are not shown in FIG. 1 .
- the backlight module 100 of the display device may include a carrier 110 , a plurality of light-emitting diode chips 120 , a reflector 130 , a first diffuser 140 , a wavelength conversion film 160 and an optical film 170 .
- the light-emitting diode chips 120 are arranged on the carrier 110 .
- the first diffuser 140 is disposed over the carrier 110 , the light-emitting diode chips 120 and the reflector 130 .
- the reflector 130 is disposed over the carrier 110 and the light-emitting diode chips 120 and under the first diffuser 140 .
- the wavelength conversion film 160 is over the first diffuser 140 .
- the optical film 170 is over the wavelength conversion film 160 .
- the backlight module 100 of the display device serves as a light source of the display panel which provides required brightness of the display images to the display panel, such that the display panel is able to display the display images to the users watching the display device.
- FIG. 2 illustrates an exploded view of the backlight module 100 , including the carrier 110 , the light-emitting diode chips 120 , the reflector 130 and the first diffuser 140 , in the display device according to some embodiments of the present disclosure.
- the carrier 110 may be a printed circuit board.
- the light-emitting diode chips 120 are arranged on the carrier 110 .
- the light-emitting diode chips 120 are mini LEDs, micro LEDs or other miniaturized LED chips.
- the light-emitting diode chips 120 are arranged on the carrier 110 in any suitable form of package, such as chip on board (COB) or package on board (POB).
- COB chip on board
- POB package on board
- the light-emitting diode chips 120 may be arranged on the carrier 110 in array.
- the light-emitting diode chips 120 may emit blue light, and the blue light may be converted into white light by the wavelength conversion film 160 (see FIG. 1 ).
- the reflector 130 is disposed over or around the light-emitting diode chips 120 .
- the reflector 130 has a bottom surface and sidewall portions surrounding the bottom surface. The bottom surface has a plurality of holes corresponding to the locations of the light-emitting diode chips 120 , such that the light-emitting diode chips 120 are exposed in the holes and the emitted light is not reflected back toward the carrier by the reflector 130 .
- the sidewall portions of the reflector 130 is configured to reflect the light emitted by the light-emitting diode chips 120 upwardly in order to ensure all emitted light passing through the first diffuser 140 .
- the reflector 130 is formed of polyethylene terephthalate (PET), and the reflectivity is higher than 99%.
- the first diffuser 140 is disposed over the reflector 130 and is configured to diffuse the light emitted by light-emitting diode chips 120 in order to improve the luminance uniformity of the displayed images.
- the detailed structure of the first diffuser 140 is referred to FIGS. 3 - 4 .
- FIG. 3 illustrates a perspective view of the first diffuser 140 in some embodiments of the present disclosure
- FIG. 4 illustrates a top view of the first diffuser 140 in some embodiments of the present disclosure.
- the first diffuser 140 includes a first substrate 142 , a first prismatic structure 144 and a plurality of first ink structures 154 .
- the first substrate 142 is a flat plate and has an upper surface 142 S distal from the carrier 110 . That is, the upper surface 142 S of the first substrate 142 does not face the carrier 110 but faces the direction away from the carrier 110 .
- the first prismatic structure 144 is disposed on the upper surface 142 S of the first substrate 142 .
- the first prismatic structure 144 includes a first prismatic sub-structure 146 , a second prismatic sub-structure 148 , a third prismatic sub-structure 150 and a fourth prismatic sub-structure 152 .
- Each prismatic sub-structure of the first prismatic structure 144 such as the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 , has a plurality of surfaces 144 S inclined with respect to the upper surface 142 S of the first substrate 142 .
- first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 of the first prismatic structure 144 have a first vertex 144 A protruding from the first substrate 142 respectively, such as the vertices of the prismatic sub-structures, and a plurality of the second vertices 144 B in contact with the upper surface 142 S of the first substrate 142 .
- the surfaces 144 S of any prismatic sub-structures in the first prismatic structure 144 intersect at top and define the first vertex 144 A protruding upwards, and each two adjacent surfaces 144 S of any prismatic sub-structures intersect at bottom and define the second vertex 144 B at the upper surface 142 S of the first substrate 142 .
- the first prismatic sub-structure 146 , the second prismatic sub-structure 148 and the upper surface 142 S of the first substrate 142 together define a gap 144 G.
- a V-shaped recess 144 R is formed between the third prismatic sub-structure 150 and the first prismatic sub-structure 146 , and as shown in FIG. 4 , the third prismatic sub-structure 150 and the first prismatic sub-structure 146 are symmetrical with respect to the V-shaped recess 144 R. Stated another way, the surface 144 S of the first prismatic sub-structure 146 and the surface 144 S of the second prismatic sub-structure 148 are not in physical contact with each other, but both connect to the upper surface 142 S of the first substrate 142 .
- the gap 144 G is between the first prismatic sub-structure 146 and the second prismatic sub-structure 148 , and the bottom of the gap 144 G is the upper surface 142 S of the first substrate 142 .
- the bottom of the gap 144 G is a flat surface.
- the surface 144 S of the first prismatic sub-structure 146 and the surface 144 S of the third prismatic sub-structure 150 are in direct contact with each other. Therefore, the V-shaped recess 144 R is formed between the first prismatic sub-structure 146 and the third prismatic sub-structure 150 , and the V-shaped recess 144 R does not expose the upper surface 142 S of the first substrate 142 .
- the V-shaped recess 144 R does not have a flat surface bottom but just a V groove. Therefore, the distance between the first prismatic sub-structure 146 and the second prismatic sub-structure 148 is greater than the distance between the first prismatic sub-structure 146 and the third prismatic sub-structure 150 . Moreover, the gap 144 G is also between the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 , and the fourth prismatic sub-structure 152 and the second prismatic sub-structure 148 are symmetrical with respect to the line B-B. The distance between the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 is greater than the distance between the first prismatic sub-structure 146 and the third prismatic sub-structure 150 .
- first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 may be combined into a prismatic sub-structure unit, which can be arranged in a 2 -D array as shown in FIGS. 3 and 4 and forms the first prismatic structure 144 . Moreover, every prismatic sub-structure unit is separated from each other by a distance, such as by the gap 144 G between therein.
- the first diffuser 140 is formed of translucent materials which may be rolled by precision roller to form the first prismatic structure 144 thereon. Therefore, the light emitted from the underneath light-emitting diode chips 120 can be diffused through the first diffuser 140 and further refracted by the first prismatic structure 144 .
- the translucent material of the first diffuser 140 is doped with diffusing agents or particles. Details of the transmission path of the light in the first diffuser 140 will be described in FIGS. 14 A- 14 D .
- the first ink structures 154 are located in the gap 144 G and in contact with the upper surface 142 S of the first substrate 142 .
- the first ink structures 154 may be at any suitable locations in the gap 144 G.
- the first ink structures 154 are adjacent to at least one of the second vertices 144 B of the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 , or the fourth prismatic sub-structure 152 as shown in FIG. 4 .
- the first ink structures 154 are close to the second vertices 144 B, the light of the light-emitting diode chips 120 traveling to second vertices 144 B can be effectively reflected as shown in FIG. 14 B and 14 C .
- the first ink structures 154 may also be arranged along the edges of the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 or the fourth prismatic sub-structure 152 on the upper surface 142 S of the first substrate 142 to increase the light reflection and scattering efficiency. Stated another way, the first ink structures 154 are not located in the V-shaped recess 144 R or on the surfaces 144 S of the prismatic sub-structures of the first prismatic structure 144 . Therefore, the light of the light-emitting diode chips 120 may pass through the prismatic sub-structures of the first prismatic structure 144 .
- the first ink structures 154 may be formed by printing ink to specific locations on the upper surface 142 S of the first substrate 142 .
- the ink may include TiO 2 . Therefore, the first ink structures 154 may also include TiO 2 . More specifically, the first ink structures 154 may include rutile TiO 2 , anatase TiO 2 or combinations thereof. The first ink structures 154 including TiO 2 provide high reflectance to the blue light.
- the blue light of the light-emitting diode chips 120 is refracted from the first diffuser 140 and enters into the wavelength conversion film 160 disposed above the first diffuser 140 , a small amount of the refracted blue light will be reflected by the wavelength conversion film 160 back to the first diffuser 140 .
- the first ink structures 154 to reflect blue light can reflect the reflected blue light back to wavelength conversion film 160 . Therefore, the blue light which does not enter into the wavelength conversion film 160 directly can be scattered and reflected between the first diffuser 140 and the wavelength conversion film 160 , which provides better light mixing efficiency.
- TiO 2 exhibits strong absorbance of violet and ultraviolet light. Therefore the absorbance of violet and ultraviolet light of the first ink structures 154 or the first diffuser 140 may be adjusted by changing the weight percentage of TiO 2 in the first ink structures 154 or the first diffuser 140 . Such implementation can improve the purity of the output blue light, which enhances the color performance of the light after passing through and being converted by the wavelength conversion film 160 . The damage caused by the light from the display device to human's eye can also be reduced.
- the weight percentage of TiO 2 in the first ink structures 154 disposed on the first diffuser 140 is from 0.01% to 0.1%.
- the amount of TiO 2 in the first ink structures 154 may be insufficient to reflect the light of the light-emitting diode chips 120 , or the amount of TiO 2 in the first ink structures 154 may be too much to cause insufficient light transmittance.
- FIGS. 5 - 6 illustrate cross-section views of the first prismatic structure 144 in some embodiments of the present disclosure.
- FIG. 5 illustrates the cross-section view of the first prismatic structure 144 taken along line A-A in FIG. 4 .
- FIG. 6 illustrates the cross-section view of the first prismatic structure 144 taken along line B-B in FIG. 4 .
- the first ink structures 154 are not illustrated in FIGS. 5 and 6 for simplicity.
- an angle D 1 is between the opposite sides of the adjacent second prismatic sub-structure 148 and fourth prismatic sub-structure 152
- an angle D 2 is between the opposite sides of the adjacent first prismatic sub-structure 146 and third prismatic sub-structure 150 .
- FIG. 5 illustrates the cross-section view of the first prismatic structure 144 taken along line A-A in FIG. 4 .
- FIG. 6 illustrates the cross-section view of the first prismatic structure 144 taken along line B-B in FIG. 4 .
- an angle D 1 is between the opposite sides of
- an angle D 3 is between the adjacent sides of the first prismatic sub-structure 146 and second prismatic sub-structure 148 which are overlapped in the side view.
- the angle D 1 , D 2 and D 3 may be from about 90 degree to about 130 degree. If the angle D 1 , D 2 and D 3 are within the disclosed range about 90 to 130 degree, the first diffuser 140 can provide refractions with better light energy distribution effect.
- the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 have a height H 1 between about 0.3 mm and about 0.5 mm.
- the wavelength conversion film 160 in the backlight module 100 of the display device is disposed over the first diffuser 140 .
- Wavelength conversion materials such as quantum dots or phosphors are filled in the wavelength conversion film 160 to convert the light from the light-emitting diode chips 120 into the light with different wavelengths.
- the wavelength conversion film 160 may include red quantum dots that convert blue light into red light and green quantum dots that convert blue light into green light. After the light of the light-emitting diode chips 120 passes through the first diffuser 140 and enters into the wavelength conversion film 160 , the red light and green light generated by wavelength conversion are mixed with the blue light to generate the white light.
- the optical film 170 is disposed over the wavelength conversion film 160 .
- the optical film 170 may be prism sheet, diffuser, micro lens film, dual brightness enhancement film (DBEF), composite film structures or multiple films.
- FIG. 7 illustrates a side view of a backlight module 200 in the display device according to some embodiments of the present disclosure.
- FIG. 8 illustrates an exploded view of a portion of the backlight module 200 in the display device according to some embodiments of the present disclosure.
- the difference between the backlight module 200 and the backlight module 100 of the display devices is that the backlight module 200 of the display device further includes a second diffuser 180 .
- the second diffuser 180 is disposed over the first diffuser 140 and under the wavelength conversion film 160 .
- Other components of the backlight module 200 in the display device are similar to or same as the backlight module 100 in the display device. Therefore, related details are not repeatedly described herein.
- FIG. 9 illustrates a perspective view of the second diffuser 180 according to some embodiments of the present disclosure
- FIG. 10 illustrates a top view of the second diffuser 180 according to some embodiments of the present disclosure
- FIG. 11 illustrates a bottom view of the second diffuser 180 in some embodiments of the present disclosure.
- the second diffuser 180 includes a second substrate 182 and a plurality of second ink structures 194 .
- the second ink structures 194 are disposed at a bottom surface 182 S 1 of the second substrate 182 facing the first diffuser 140 , and the locations of second ink structures 194 are directly over the first vertices 144 A of the prismatic sub-structures, such as the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 , of the first prismatic structure 144 respectively.
- the second ink structures 194 can diffusely reflect the refracted light back to the first diffuser 140 , which improves the scattering and the reflection efficiency of the diffusers.
- the arrangement of the second ink structures 194 is shown in FIG. 10 .
- the second ink structures 194 may comprise the same materials as and the first ink structures 154 . Therefore, the second ink structures 194 may also include TiO 2 .
- the weight percentage of TiO 2 in the second ink structures 194 at the bottom surface of the second diffuser 180 can be adjusted based on different situations or applications. In some embodiments, the weight percentage of TiO 2 in the first ink structures 154 on the first diffuser 140 is less than the weight percentage of TiO 2 in the second ink structures 194 at the bottom surface of the second diffuser 180 . In some embodiments, the weight percentage of TiO 2 in the second ink structures 194 at the bottom surface of the second diffuser 180 is between about 0.1% and about 0.5%.
- weight percentages of TiO 2 in the first ink structures 154 and the second ink structures 194 are within the disclosed range, a better scattered reflection is provided for the light traveling between the first diffuser 140 and the second diffuser 180 .
- a higher weight percentage of TiO 2 in the second ink structures 194 of second diffuser 180 than the first ink structures 154 can provide sufficient light transmittance and save certain energy loss of light reflection.
- the second diffuser 180 further includes a second prismatic structure 184 , which may include a fifth prismatic sub-structure 186 , a sixth prismatic sub-structure 188 , a seventh prismatic sub-structure 190 and a eighth prismatic sub-structure 192 .
- the fifth prismatic sub-structure 186 , the sixth prismatic sub-structure 188 , the seventh prismatic sub-structure 190 and the eighth prismatic sub-structure 192 are arranged on the upper surface 182 S 2 of the second substrate 182 , and the upper surface 182 S 2 of the second substrate 182 is distal from the first diffuser 140 .
- Each fifth prismatic sub-structure 186 includes a third vertex 184 A protruding upwards from the upper surface 182 S 2 of the second substrate 182 respectively, such as the vertices of the prismatic sub-structures, and a plurality of fourth vertices 1846 in contact with the upper surface 182 S 2 of the second substrate 182 .
- the shapes of the fifth prismatic sub-structure 186 , the sixth prismatic sub-structure 188 , the seventh prismatic sub-structure 190 and the eighth prismatic sub-structure 192 are similar to the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 except the sizes thereof.
- the sizes of the first prismatic sub-structure 146 , the second prismatic sub-structure 148 , the third prismatic sub-structure 150 and the fourth prismatic sub-structure 152 may be larger than the sizes of the fifth prismatic sub-structure 186 , the sixth prismatic sub-structure 188 , the seventh prismatic sub-structure 190 and the eighth prismatic sub-structure 192 , and there is no ink structure in the gaps of the second prismatic structures 184 on the upper surface 182 S 2 of the second substrate 182 .
- the second substrate 182 and the first substrate 142 may be made of similar or same materials.
- the arrangement of the second ink structures 194 of the second diffuser 180 is aligned with the first prismatic structure 144 of the first diffuser 140 , but is not necessarily aligned with the second prismatic structure 184 of the second diffuser 180 . That is, the arrangement of the second ink structures 194 at the bottom surface may not be aligned with the second prismatic structure 184 on the upper surface of the second diffuser 180 .
- FIGS. 12 - 13 illustrate side views of the second prismatic structure 184 in some embodiments of the present disclosure.
- FIG. 12 illustrates a cross-section view of the second prismatic structure 184 taken along line C-C in FIG. 10
- FIG. 13 illustrates a cross-section view of the second prismatic structure 184 taken along line D-D in FIG. 10 .
- the second ink structures 194 are not illustrated in FIGS. 12 and 13 for simplicity.
- an angle D 4 is between the opposite sides of the adjacent sixth prismatic sub-structure 188 and eighth prismatic sub-structure 192
- an angle D 5 is between the opposite sides of the adjacent fifth prismatic sub-structure 186 and seventh prismatic sub-structure 190 .
- FIG. 12 illustrates a cross-section view of the second prismatic structure 184 taken along line C-C in FIG. 10
- FIG. 13 illustrates a cross-section view of the second prismatic structure 184 taken along line D-D in FIG. 10 .
- the second ink structures 194 are not illustrated in
- an angle D 6 is between the adjacent sides of the fifth prismatic sub-structure 186 and sixth prismatic sub-structure 188 which are overlapped in the side view.
- the angle D 4 , D 5 and D 6 may be from about 90 degree to about 130 degree. If the angle D 4 , D 5 and D 6 are within the disclosed range about 90 to 130 degree, the second diffuser 180 can provide refractions with better light energy distribution effect.
- the fifth prismatic sub-structure 186 , the sixth prismatic sub-structure 188 , the seventh prismatic sub-structure 190 and the eighth prismatic sub-structure 192 have a height H 2 between about 0.1 mm and about 0.3 mm.
- FIG. 14 A illustrates the relative position of the first diffuser 140 and the second diffuser 180 .
- the first diffuser 140 may further include some supporting structures 156 as shown in FIG. 14 A .
- the supporting structures 156 are disposed on the upper surface 142 S of the first substrate 142 and are adjacent to the first prismatic structure 144 .
- the first diffuser 140 may include at least three supporting structures 156 dispersedly disposed among the first prismatic structure 144 .
- the height of the supporting structure 156 is greater than the height of the first prismatic structure 144 .
- the supporting structures 156 are in contact with the bottom surface 182 S 1 of the second substrate 182 and support the second diffuser 180 , such that the first prismatic structure 144 of the first diffuser 140 is not in contact with the second diffuser 180 .
- the first prismatic structure 144 is separated from the second diffuser 180 by a distance L 1 .
- the bottom surface 182 S 1 of the second substrate 182 of the second diffuser 180 has a recess 182 R, such that the supporting structure 156 can contact or couple with the recess 182 R. After the supporting structure 156 contacts or couples with the recess 182 R, the first diffuser 140 and the second diffuser 180 are fixed in the relative position.
- the first prismatic structure 144 of the first diffuser 140 and the second diffuser 180 are kept in a distance, or the second ink structures 194 are correspondingly matched to the first prismatic structure 144 .
- the distance L 1 is kept between the first prismatic structure 144 of the first diffuser 140 and the second diffuser 180 , the difference between the refractive index of air and the diffuser provides good refraction effect to the light travelling between the diffusers.
- FIGS. 14 B- 14 D illustrate some light paths of the light transmitted from the light-emitting diode chips 120 in the backlight module 200 of the display device.
- the light of the light-emitting diode chips 120 enters the first diffuser 140 from the bottom surface of the first diffuser 140 and is refracted by the inclined surface of the first prismatic structure 144 as shown in FIG. 14 B .
- Part of the refracted light is reflected back by the diffusing agents in the second diffuser 180 , or reflected by the quantum dots in the wavelength conversion film 160 if the second diffuser 180 is not implemented, toward the first diffuser 140 .
- the first ink structures 154 may reflect this part of light back to the second diffuser 180 , or the wavelength conversion film 160 if the second diffuser 180 is not implemented.
- the light emitted by the light-emitting diode chips 120 can be diffusely reflected between the first diffuser 140 and the second diffuser 180 , or between first diffuser 140 and the wavelength conversion film 160 , thereby improving the light mixing effect of the backlight module and the brightness uniformity of the displayed images.
- part of the light may pass through a portion of the upper surface 142 S of the first diffuser 140 , as shown in Fig, 14 C, where the first ink structures 154 are not printed on.
- This part of light passing through the first diffuser 140 may enter the second prismatic structure 184 of the second diffuser 180 and be reflected back to the first ink structures 154 of the first diffuser 140 by the second prismatic structure 184 .
- part of the light may pass the first vertex 144 A of the first prismatic structure 144 on the first diffuser 140 , as shown in FIG. 14 D .
- This part of light may leave the first prismatic structure 144 and directly enter the second ink structures 194 , and the second ink structures 194 will diffusely reflect this part of light back to the first diffuser 140 .
- the light emitted by the light-emitting diode chips 120 can be diffusely reflected between the first diffuser 140 and the second diffuser 180 , thereby improving the light mixing effect of the backlight module and the brightness uniformity of the displayed images.
- the display device includes the backlight module 100 or 200 of the present disclosure, the amount of the light-emitting diode chips 120 required in the backlight module 100 or 200 can be effectively reduced while providing same brightness uniformity as the prior art display device with more light-emitting diode chips 120 . The manufacturing cost of the display device can therefore be effectively reduced.
- FIG. 15 A illustrates the brightness uniformity distribution in the backlight module of a prior art display device
- FIG. 15 B illustrates the brightness uniformity distribution in the backlight module 200 of the display device according to some embodiments of the present disclosure
- Y-axis in FIGS. 15 A and 15 B represents normalized uniformity of brightness
- X-axis in FIGS. 15 A and 15 B represents horizontal or vertical distance in the backlight modules.
- curve 301 illustrates the brightness uniformity distribution along horizontal direction in the backlight module of the prior art display device
- curve 302 illustrates the brightness uniformity distribution along vertical direction in the backlight module of the prior art display device.
- curve 303 illustrates the brightness uniformity distribution along horizontal direction in the backlight module 200 of the display device in some embodiments of the present disclosure
- curve 304 illustrates the brightness uniformity distribution along vertical direction in the backlight module 200 of the display device in some embodiments of the present disclosure.
- the curves in FIG. 15 B which representing the brightness uniformity in the backlight module 200 of the display device is smoother than the curves in FIG. 15 A , which representing the brightness uniformity in the backlight module of the prior art display device. Therefore, the brightness uniformity is improved by the backlight module of the present disclosure and better than the prior arts.
- the backlight module of the display device in some embodiments of the present disclosure has the diffuser with ink structures printed at certain locations.
- the ink structures of the first diffuser may be printed in the gaps among the first prismatic structure
- the ink structures of the second diffuser may be printed at the locations corresponding to the first vertex of the first prismatic structure.
- the light emitted from the light-emitting diodes may be scattered and diffusely reflected between the first diffuser and the second diffuser, which can improve the light mixing effect.
- the brightness uniformity of the backlight module in the display device can thereby be improved.
- the display device has implemented the structures mentioned above, the light-emitting diodes required in the backlight module of the display device can be reduced and the backlight module can still maintain same luminance effect. The manufacturing cost of the display device can thereby be reduced.
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Abstract
Description
- This application claims priority to Taiwan Application Serial Number 110148283, filed Dec. 22, 2021, and Taiwan Application Serial Number 111111707, filed Mar. 28, 2022, which are herein incorporated by reference in its entirety.
- The present disclosure relates to a backlight module of a display device. More particularly, the present disclosure relates to the backlight module of the display device with ink structures printed at certain locations of a diffuser.
- With the resolutions of display devices increasing, a research direction is headed to improve light uniformity of the backlight modules within the display devices. There are several existed ways to improve light uniformity of backlight modules. For example, the amount of light-emitting diodes (LED) in the backlight modules may be increased to improve luminance coverages, such that the dark spots not overlapped by the light energies can be solved. Alternatively, the materials of the diffusers in the backlight modules may be modified to enhance the secondary diffusions of lights emitted by the light-emitting diodes. Recent trends of backlight modules is implementing mini LEDs as the light sources to increase light intensities. However, mini LED package structures do not include secondary optical lens to spread the emitted lights. Therefore, new light diffusion technique is required to improve the light distributions of such backlight modules.
- Some embodiments of the present disclosure provide a backlight module of a display including a carrier, a plurality of light-emitting diode chips and a first diffuser. The light-emitting diode chips are arranged on the carrier. The first diffuser is over the carrier and the light-emitting diode chips. The first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures. The first substrate has an upper surface distal from the carrier. The first prismatic structure is at the upper surface of the first substrate. The first prismatic structure includes a first prism sub-structure and a second prism sub-structure, and the first prism sub-structure, the second prism sub-structure and the upper surface of the first substrate together define a gap. The first ink structures are in the gap and are in contact with the upper surface of the first substrate.
- In some embodiments, the first prism sub-structure of the first prismatic structure has a first vertex protruding from the first substrate and a plurality of second vertices in contact with the upper surface of the first substrate, and the first ink structures are adjacent to at least one of the second vertices.
- In some embodiments, the first prismatic structure further comprises a third prism sub-structure, a V-shaped recess is formed between the third prism sub-structure and the first prism sub-structure, and the third prism sub-structure and the first prism sub-structure are symmetrical with the V-shaped recess.
- In some embodiments, the first ink structures are not in the V-shaped recess.
- In some embodiments, the first prismatic structure has a plurality of surfaces inclined with respect to the upper surface of the first substrate, and the first ink structures are not on the surfaces.
- In some embodiments, the backlight module further comprises a second diffuser over the first diffuser. The second diffuser comprises a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser. The first prism sub-structure and the second prism sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prism sub-structure and the second prism sub-structure respectively.
- In some embodiments, the second diffuser further includes a second prismatic structure, the second prismatic structure includes a plurality of fourth prism sub-structures arranged at an upper surface of the second substrate, the upper surface of the second substrate is distal from the first diffuser. Each of the fourth prism sub-structures includes a third vertex protruding from the upper surface of the second substrate and a plurality of fourth vertices in contact with the upper surface of the second substrate.
- In some embodiments, a size of the first prism sub-structure of the first diffuser is larger than a size of any of the fourth prism sub-structures of the second diffuser.
- In some embodiments, the first diffuser further includes a supporting structure on the upper surface of the first substrate and adjacent to the first prismatic structure, and a height of the supporting structure is greater than that of the first prismatic structure.
- In some embodiments, a first weight percentage of TiO2 in the first ink structures in the gap of the first diffuser is lower than a second weight percentage of TiO2 in the second ink structures at the bottom surface of the second substrate.
- In some embodiments, the backlight module further includes a wavelength conversion film over the first diffuser and an optical film over the wavelength conversion film.
- Some embodiments of the present disclosure provide a display device including a display panel, a back plate and a backlight module accommodated in a space formed by the display panel and the back plate. The backlight module includes a carrier, a plurality of light-emitting diode chips arranged on the carrier and a first diffuser over the carrier and the light-emitting diode chips. The first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures. The first substrate has an upper surface distal from the carrier. The first prismatic structure is at the upper surface of the first substrate, and the first prismatic structure includes a first prismatic sub-structure and a second prismatic sub-structure, and the first prismatic sub-structure, the second prismatic sub-structure and the upper surface of the first substrate together define a gap. The first ink structures are in the gap and in contact with the upper surface of the first substrate.
- In some embodiments, the display device further includes a second diffuser over the first diffuser, and the second diffuser includes a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser. The first prismatic sub-structure and the second prismatic sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prismatic sub-structure and the second prismatic sub-structure respectively.
- In some embodiments, the first ink structures include rutile TiO2, anatase TiO2 or combinations thereof.
- In some embodiments, the first prismatic structure has a plurality of surfaces inclined with respect to the upper surface of the first substrate, and the first ink structures are not on the surfaces.
- Some embodiments of the present disclosure provide a diffuser set including a first diffuser. The first diffuser includes a first substrate, a first prismatic structure and a plurality of first ink structures. The first substrate has an upper surface. The first prismatic structure is at the upper surface of the first substrate, and the first prismatic structure includes a first prismatic sub-structure and a second prismatic sub-structure, and the first prismatic sub-structure, the second prismatic sub-structure and the upper surface of the first substrate together define a gap. The first ink structures are in the gap and in contact with the upper surface of the first substrate.
- In some embodiments, the diffuser set further includes a second diffuser over the first diffuser. The second diffuser includes a second substrate and a plurality of second ink structures at a bottom surface of the second substrate facing the first diffuser. The first prismatic sub-structure and the second prismatic sub-structure of the first diffuser have first vertices protruding from the first substrate respectively, and the second ink structures are directly over the first vertices of the first prismatic sub-structure and the second prismatic sub-structure respectively.
- In some embodiments, a first weight percentage of TiO2 in the first ink structures in the gap of the first diffuser is lower than a second weight percentage of TiO2 in the second ink structures at the bottom surface of the second substrate.
- In some embodiments, the first prismatic structure of the first diffuser and the second diffuser are kept in a distance.
- In some embodiments, the first ink structures comprise rutile TiO2, anatase TiO2 or combinations thereof.
- As mentioned above, the ink structures on the diffuser are printed at certain locations to reach better effect of light mixing. Therefore, uniformity of images of the display is improved. Moreover, the usage of light-emitting diode chips in the display may also be reduced.
- It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the invention as claimed.
- The disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows:
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FIG. 1 illustrates a side view of a backlight module of a display in some embodiments of the present disclosure. -
FIG. 2 illustrates an exploded view of the carrier, the light-emitting diode chips, the reflector and the first diffuser of the backlight module of the display in some embodiments of the present disclosure. -
FIG. 3 illustrates a perspective view of the first diffuser in some embodiments of the present disclosure. -
FIG. 4 illustrates a top view of the first diffuser in some embodiments of the present disclosure. -
FIG. 5 illustrates the cross-section view of the first prismatic structure taken along line A-A inFIG. 4 . -
FIG. 6 illustrates the cross-section view of the first prismatic structure taken along line B-B inFIG. 4 . -
FIG. 7 illustrates a side view of a backlight module of the display in some embodiments of the present disclosure. -
FIG. 8 illustrates an exploded view of the carrier, the light-emitting diode chips, the reflector, the first diffuser and the second diffuser of the backlight module of the display in some embodiments of the present disclosure. -
FIG. 9 illustrates a perspective view of the second diffuser in some embodiments of the present disclosure. -
FIG. 10 illustrates a top view of the second diffuser in some embodiments of the present disclosure. -
FIG. 11 illustrates a bottom view of the second diffuser in some embodiments of the present disclosure. -
FIG. 12 illustrates the cross-section view of the first prismatic structure taken along line C-C inFIG. 10 . -
FIG. 13 illustrates the cross-section view of the first prismatic structure taken along line D-D inFIG. 10 . -
FIG. 14A illustrates the relative position of the first diffuser and the second diffuser. -
FIGS. 14B-14D illustrate the paths of light of the light-emitting diode chips in the backlight module of the display. -
FIG. 15A illustrates the uniformity distribution of the backlight module of the display in prior arts. -
FIG. 15B illustrates the uniformity distribution of the backlight module of the display in some embodiments of the present disclosure. - Some embodiments of the present disclosure are disclosed in following figures. Several practical details will be described in the following description for clearness. However, a person having ordinary skill in the art should know that these practical details may not be necessary in other embodiments of the present disclosure and should not be used to limit the present disclosure. Moreover, some known and common structures and components are illustrated in simple ways for simplicity of figures.
- A display device in some embodiments of the present disclosure includes a backlight module with a diffuser having ink structures. In some embodiments of the present disclosure, the ink structures are printed at certain locations on the diffuser to provide better light mixing effect. Therefore, luminance uniformity of images displayed by the display device can be improved. Moreover, the amount of light-emitting diode chips in the backlight modules of the display devices may also be reduced.
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FIG. 1 illustrates a side view of abacklight module 100 of the display device in some embodiments of the present disclosure, and thebacklight module 100 of the display device is accommodated in a space formed by a display panel and a back plate or a frame, which are not shown inFIG. 1 . Thebacklight module 100 of the display device may include acarrier 110, a plurality of light-emittingdiode chips 120, areflector 130, afirst diffuser 140, awavelength conversion film 160 and anoptical film 170. The light-emittingdiode chips 120 are arranged on thecarrier 110. Thefirst diffuser 140 is disposed over thecarrier 110, the light-emittingdiode chips 120 and thereflector 130. Thereflector 130 is disposed over thecarrier 110 and the light-emittingdiode chips 120 and under thefirst diffuser 140. Thewavelength conversion film 160 is over thefirst diffuser 140. Theoptical film 170 is over thewavelength conversion film 160. Thebacklight module 100 of the display device serves as a light source of the display panel which provides required brightness of the display images to the display panel, such that the display panel is able to display the display images to the users watching the display device. -
FIG. 2 illustrates an exploded view of thebacklight module 100, including thecarrier 110, the light-emittingdiode chips 120, thereflector 130 and thefirst diffuser 140, in the display device according to some embodiments of the present disclosure. Thecarrier 110 may be a printed circuit board. The light-emittingdiode chips 120 are arranged on thecarrier 110. In some embodiments, the light-emittingdiode chips 120 are mini LEDs, micro LEDs or other miniaturized LED chips. The light-emittingdiode chips 120 are arranged on thecarrier 110 in any suitable form of package, such as chip on board (COB) or package on board (POB). The light-emittingdiode chips 120 may be arranged on thecarrier 110 in array. In some embodiments, the light-emittingdiode chips 120 may emit blue light, and the blue light may be converted into white light by the wavelength conversion film 160 (seeFIG. 1 ). Thereflector 130 is disposed over or around the light-emitting diode chips 120. In some embodiments, thereflector 130 has a bottom surface and sidewall portions surrounding the bottom surface. The bottom surface has a plurality of holes corresponding to the locations of the light-emittingdiode chips 120, such that the light-emittingdiode chips 120 are exposed in the holes and the emitted light is not reflected back toward the carrier by thereflector 130. The sidewall portions of thereflector 130 is configured to reflect the light emitted by the light-emittingdiode chips 120 upwardly in order to ensure all emitted light passing through thefirst diffuser 140. In some embodiments, thereflector 130 is formed of polyethylene terephthalate (PET), and the reflectivity is higher than 99%. - The
first diffuser 140 is disposed over thereflector 130 and is configured to diffuse the light emitted by light-emittingdiode chips 120 in order to improve the luminance uniformity of the displayed images. The detailed structure of thefirst diffuser 140 is referred toFIGS. 3-4 .FIG. 3 illustrates a perspective view of thefirst diffuser 140 in some embodiments of the present disclosure, andFIG. 4 illustrates a top view of thefirst diffuser 140 in some embodiments of the present disclosure. Thefirst diffuser 140 includes afirst substrate 142, a firstprismatic structure 144 and a plurality offirst ink structures 154. Thefirst substrate 142 is a flat plate and has anupper surface 142S distal from thecarrier 110. That is, theupper surface 142S of thefirst substrate 142 does not face thecarrier 110 but faces the direction away from thecarrier 110. - The first
prismatic structure 144 is disposed on theupper surface 142S of thefirst substrate 142. The firstprismatic structure 144 includes a firstprismatic sub-structure 146, a secondprismatic sub-structure 148, a thirdprismatic sub-structure 150 and a fourthprismatic sub-structure 152. Each prismatic sub-structure of the firstprismatic structure 144, such as the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152, has a plurality ofsurfaces 144S inclined with respect to theupper surface 142S of thefirst substrate 142. Moreover, the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 of the firstprismatic structure 144 have afirst vertex 144A protruding from thefirst substrate 142 respectively, such as the vertices of the prismatic sub-structures, and a plurality of thesecond vertices 144B in contact with theupper surface 142S of thefirst substrate 142. In particular, thesurfaces 144S of any prismatic sub-structures in the firstprismatic structure 144 intersect at top and define thefirst vertex 144A protruding upwards, and each twoadjacent surfaces 144S of any prismatic sub-structures intersect at bottom and define thesecond vertex 144B at theupper surface 142S of thefirst substrate 142. - The first
prismatic sub-structure 146, the secondprismatic sub-structure 148 and theupper surface 142S of thefirst substrate 142 together define agap 144G. A V-shapedrecess 144R is formed between the thirdprismatic sub-structure 150 and the firstprismatic sub-structure 146, and as shown inFIG. 4 , the thirdprismatic sub-structure 150 and the firstprismatic sub-structure 146 are symmetrical with respect to the V-shapedrecess 144R. Stated another way, thesurface 144S of the firstprismatic sub-structure 146 and thesurface 144S of the secondprismatic sub-structure 148 are not in physical contact with each other, but both connect to theupper surface 142S of thefirst substrate 142. Therefore, thegap 144G is between the firstprismatic sub-structure 146 and the secondprismatic sub-structure 148, and the bottom of thegap 144G is theupper surface 142S of thefirst substrate 142. Stated another way, the bottom of thegap 144G is a flat surface. Moreover, thesurface 144S of the firstprismatic sub-structure 146 and thesurface 144S of the thirdprismatic sub-structure 150 are in direct contact with each other. Therefore, the V-shapedrecess 144R is formed between the firstprismatic sub-structure 146 and the thirdprismatic sub-structure 150, and the V-shapedrecess 144R does not expose theupper surface 142S of thefirst substrate 142. Stated another way, the V-shapedrecess 144R does not have a flat surface bottom but just a V groove. Therefore, the distance between the firstprismatic sub-structure 146 and the secondprismatic sub-structure 148 is greater than the distance between the firstprismatic sub-structure 146 and the thirdprismatic sub-structure 150. Moreover, thegap 144G is also between the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152, and the fourthprismatic sub-structure 152 and the secondprismatic sub-structure 148 are symmetrical with respect to the line B-B. The distance between the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 is greater than the distance between the firstprismatic sub-structure 146 and the thirdprismatic sub-structure 150. - In some embodiments, the first
prismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 may be combined into a prismatic sub-structure unit, which can be arranged in a 2-D array as shown inFIGS. 3 and 4 and forms the firstprismatic structure 144. Moreover, every prismatic sub-structure unit is separated from each other by a distance, such as by thegap 144G between therein. - In some embodiments, the
first diffuser 140 is formed of translucent materials which may be rolled by precision roller to form the firstprismatic structure 144 thereon. Therefore, the light emitted from the underneath light-emittingdiode chips 120 can be diffused through thefirst diffuser 140 and further refracted by the firstprismatic structure 144. In some embodiments, the translucent material of thefirst diffuser 140 is doped with diffusing agents or particles. Details of the transmission path of the light in thefirst diffuser 140 will be described inFIGS. 14A-14D . - The
first ink structures 154 are located in thegap 144G and in contact with theupper surface 142S of thefirst substrate 142. Thefirst ink structures 154 may be at any suitable locations in thegap 144G. In some embodiments, thefirst ink structures 154 are adjacent to at least one of thesecond vertices 144B of the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150, or the fourthprismatic sub-structure 152 as shown inFIG. 4 . When thefirst ink structures 154 are close to thesecond vertices 144B, the light of the light-emittingdiode chips 120 traveling tosecond vertices 144B can be effectively reflected as shown inFIG. 14B and 14C . - In some other embodiments, the
first ink structures 154 may also be arranged along the edges of the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 or the fourthprismatic sub-structure 152 on theupper surface 142S of thefirst substrate 142 to increase the light reflection and scattering efficiency. Stated another way, thefirst ink structures 154 are not located in the V-shapedrecess 144R or on thesurfaces 144S of the prismatic sub-structures of the firstprismatic structure 144. Therefore, the light of the light-emittingdiode chips 120 may pass through the prismatic sub-structures of the firstprismatic structure 144. - In some embodiments, the
first ink structures 154 may be formed by printing ink to specific locations on theupper surface 142S of thefirst substrate 142. In some embodiments, the ink may include TiO2. Therefore, thefirst ink structures 154 may also include TiO2. More specifically, thefirst ink structures 154 may include rutile TiO2, anatase TiO2 or combinations thereof. Thefirst ink structures 154 including TiO2 provide high reflectance to the blue light. After the blue light of the light-emittingdiode chips 120 is refracted from thefirst diffuser 140 and enters into thewavelength conversion film 160 disposed above thefirst diffuser 140, a small amount of the refracted blue light will be reflected by thewavelength conversion film 160 back to thefirst diffuser 140. Thefirst ink structures 154 to reflect blue light can reflect the reflected blue light back towavelength conversion film 160. Therefore, the blue light which does not enter into thewavelength conversion film 160 directly can be scattered and reflected between thefirst diffuser 140 and thewavelength conversion film 160, which provides better light mixing efficiency. - Moreover, TiO2 exhibits strong absorbance of violet and ultraviolet light. Therefore the absorbance of violet and ultraviolet light of the
first ink structures 154 or thefirst diffuser 140 may be adjusted by changing the weight percentage of TiO2 in thefirst ink structures 154 or thefirst diffuser 140. Such implementation can improve the purity of the output blue light, which enhances the color performance of the light after passing through and being converted by thewavelength conversion film 160. The damage caused by the light from the display device to human's eye can also be reduced. In some embodiments, the weight percentage of TiO2 in thefirst ink structures 154 disposed on thefirst diffuser 140 is from 0.01% to 0.1%. If the weight percentage of TiO2 in thefirst ink structures 154 is not within the disclosed range, the amount of TiO2 in thefirst ink structures 154 may be insufficient to reflect the light of the light-emittingdiode chips 120, or the amount of TiO2 in thefirst ink structures 154 may be too much to cause insufficient light transmittance. -
FIGS. 5-6 illustrate cross-section views of the firstprismatic structure 144 in some embodiments of the present disclosure.FIG. 5 illustrates the cross-section view of the firstprismatic structure 144 taken along line A-A inFIG. 4 .FIG. 6 illustrates the cross-section view of the firstprismatic structure 144 taken along line B-B inFIG. 4 . It is noted that thefirst ink structures 154 are not illustrated inFIGS. 5 and 6 for simplicity. InFIG. 5 , an angle D1 is between the opposite sides of the adjacent secondprismatic sub-structure 148 and fourthprismatic sub-structure 152, and an angle D2 is between the opposite sides of the adjacent firstprismatic sub-structure 146 and thirdprismatic sub-structure 150. InFIG. 6 , an angle D3 is between the adjacent sides of the firstprismatic sub-structure 146 and secondprismatic sub-structure 148 which are overlapped in the side view. The angle D1, D2 and D3 may be from about 90 degree to about 130 degree. If the angle D1, D2 and D3 are within the disclosed range about 90 to 130 degree, thefirst diffuser 140 can provide refractions with better light energy distribution effect. In addition, the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 have a height H1 between about 0.3 mm and about 0.5 mm. - Turning back to
FIG. 1 , thewavelength conversion film 160 in thebacklight module 100 of the display device is disposed over thefirst diffuser 140. Wavelength conversion materials such as quantum dots or phosphors are filled in thewavelength conversion film 160 to convert the light from the light-emittingdiode chips 120 into the light with different wavelengths. For example, thewavelength conversion film 160 may include red quantum dots that convert blue light into red light and green quantum dots that convert blue light into green light. After the light of the light-emittingdiode chips 120 passes through thefirst diffuser 140 and enters into thewavelength conversion film 160, the red light and green light generated by wavelength conversion are mixed with the blue light to generate the white light. In addition, theoptical film 170 is disposed over thewavelength conversion film 160. In some embodiments, theoptical film 170 may be prism sheet, diffuser, micro lens film, dual brightness enhancement film (DBEF), composite film structures or multiple films. -
FIG. 7 illustrates a side view of abacklight module 200 in the display device according to some embodiments of the present disclosure.FIG. 8 illustrates an exploded view of a portion of thebacklight module 200 in the display device according to some embodiments of the present disclosure. The difference between thebacklight module 200 and thebacklight module 100 of the display devices is that thebacklight module 200 of the display device further includes asecond diffuser 180. Thesecond diffuser 180 is disposed over thefirst diffuser 140 and under thewavelength conversion film 160. Other components of thebacklight module 200 in the display device are similar to or same as thebacklight module 100 in the display device. Therefore, related details are not repeatedly described herein. -
FIG. 9 illustrates a perspective view of thesecond diffuser 180 according to some embodiments of the present disclosure,FIG. 10 illustrates a top view of thesecond diffuser 180 according to some embodiments of the present disclosure, andFIG. 11 illustrates a bottom view of thesecond diffuser 180 in some embodiments of the present disclosure. Thesecond diffuser 180 includes asecond substrate 182 and a plurality ofsecond ink structures 194. Thesecond ink structures 194 are disposed at a bottom surface 182S1 of thesecond substrate 182 facing thefirst diffuser 140, and the locations ofsecond ink structures 194 are directly over thefirst vertices 144A of the prismatic sub-structures, such as the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152, of the firstprismatic structure 144 respectively. When the light is refracted from thefirst vertices 144A of the firstprismatic structure 144, thesecond ink structures 194 can diffusely reflect the refracted light back to thefirst diffuser 140, which improves the scattering and the reflection efficiency of the diffusers. - The arrangement of the
second ink structures 194 is shown inFIG. 10 . Thesecond ink structures 194 may comprise the same materials as and thefirst ink structures 154. Therefore, thesecond ink structures 194 may also include TiO2. The weight percentage of TiO2 in thesecond ink structures 194 at the bottom surface of thesecond diffuser 180 can be adjusted based on different situations or applications. In some embodiments, the weight percentage of TiO2 in thefirst ink structures 154 on thefirst diffuser 140 is less than the weight percentage of TiO2 in thesecond ink structures 194 at the bottom surface of thesecond diffuser 180. In some embodiments, the weight percentage of TiO2 in thesecond ink structures 194 at the bottom surface of thesecond diffuser 180 is between about 0.1% and about 0.5%. When the weight percentages of TiO2 in thefirst ink structures 154 and thesecond ink structures 194 are within the disclosed range, a better scattered reflection is provided for the light traveling between thefirst diffuser 140 and thesecond diffuser 180. A higher weight percentage of TiO2 in thesecond ink structures 194 ofsecond diffuser 180 than thefirst ink structures 154 can provide sufficient light transmittance and save certain energy loss of light reflection. - In some embodiments, the
second diffuser 180 further includes a secondprismatic structure 184, which may include a fifthprismatic sub-structure 186, a sixthprismatic sub-structure 188, a seventhprismatic sub-structure 190 and a eighthprismatic sub-structure 192. The fifthprismatic sub-structure 186, the sixthprismatic sub-structure 188, the seventhprismatic sub-structure 190 and the eighthprismatic sub-structure 192 are arranged on the upper surface 182S2 of thesecond substrate 182, and the upper surface 182S2 of thesecond substrate 182 is distal from thefirst diffuser 140. Each fifthprismatic sub-structure 186 includes athird vertex 184A protruding upwards from the upper surface 182S2 of thesecond substrate 182 respectively, such as the vertices of the prismatic sub-structures, and a plurality of fourth vertices 1846 in contact with the upper surface 182S2 of thesecond substrate 182. The shapes of the fifthprismatic sub-structure 186, the sixthprismatic sub-structure 188, the seventhprismatic sub-structure 190 and the eighthprismatic sub-structure 192 are similar to the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 except the sizes thereof. The sizes of the firstprismatic sub-structure 146, the secondprismatic sub-structure 148, the thirdprismatic sub-structure 150 and the fourthprismatic sub-structure 152 may be larger than the sizes of the fifthprismatic sub-structure 186, the sixthprismatic sub-structure 188, the seventhprismatic sub-structure 190 and the eighthprismatic sub-structure 192, and there is no ink structure in the gaps of the secondprismatic structures 184 on the upper surface 182S2 of thesecond substrate 182. In addition, thesecond substrate 182 and thefirst substrate 142 may be made of similar or same materials. - As shown in
FIG. 7 , the arrangement of thesecond ink structures 194 of thesecond diffuser 180 is aligned with the firstprismatic structure 144 of thefirst diffuser 140, but is not necessarily aligned with the secondprismatic structure 184 of thesecond diffuser 180. That is, the arrangement of thesecond ink structures 194 at the bottom surface may not be aligned with the secondprismatic structure 184 on the upper surface of thesecond diffuser 180. -
FIGS. 12-13 illustrate side views of the secondprismatic structure 184 in some embodiments of the present disclosure.FIG. 12 illustrates a cross-section view of the secondprismatic structure 184 taken along line C-C inFIG. 10 , andFIG. 13 illustrates a cross-section view of the secondprismatic structure 184 taken along line D-D inFIG. 10 . It is noted that thesecond ink structures 194 are not illustrated inFIGS. 12 and 13 for simplicity. InFIG. 12 , an angle D4 is between the opposite sides of the adjacent sixthprismatic sub-structure 188 and eighthprismatic sub-structure 192, and an angle D5 is between the opposite sides of the adjacent fifthprismatic sub-structure 186 and seventhprismatic sub-structure 190. InFIG. 13 , an angle D6 is between the adjacent sides of the fifthprismatic sub-structure 186 and sixthprismatic sub-structure 188 which are overlapped in the side view. The angle D4, D5 and D6 may be from about 90 degree to about 130 degree. If the angle D4, D5 and D6 are within the disclosed range about 90 to 130 degree, thesecond diffuser 180 can provide refractions with better light energy distribution effect. In addition, the fifthprismatic sub-structure 186, the sixthprismatic sub-structure 188, the seventhprismatic sub-structure 190 and the eighthprismatic sub-structure 192 have a height H2 between about 0.1 mm and about 0.3 mm. -
FIG. 14A illustrates the relative position of thefirst diffuser 140 and thesecond diffuser 180. When the display device has two diffusers, such as thefirst diffuser 140 and thesecond diffuser 180, thefirst diffuser 140 may further include some supportingstructures 156 as shown inFIG. 14A . The supportingstructures 156 are disposed on theupper surface 142S of thefirst substrate 142 and are adjacent to the firstprismatic structure 144. For example, thefirst diffuser 140 may include at least three supportingstructures 156 dispersedly disposed among the firstprismatic structure 144. The height of the supportingstructure 156 is greater than the height of the firstprismatic structure 144. Therefore, the supportingstructures 156 are in contact with the bottom surface 182S1 of thesecond substrate 182 and support thesecond diffuser 180, such that the firstprismatic structure 144 of thefirst diffuser 140 is not in contact with thesecond diffuser 180. In other words, the firstprismatic structure 144 is separated from thesecond diffuser 180 by a distance L1. In some embodiments, the bottom surface 182S1 of thesecond substrate 182 of thesecond diffuser 180 has arecess 182R, such that the supportingstructure 156 can contact or couple with therecess 182R. After the supportingstructure 156 contacts or couples with therecess 182R, thefirst diffuser 140 and thesecond diffuser 180 are fixed in the relative position. For example, the firstprismatic structure 144 of thefirst diffuser 140 and thesecond diffuser 180 are kept in a distance, or thesecond ink structures 194 are correspondingly matched to the firstprismatic structure 144. When the distance L1 is kept between the firstprismatic structure 144 of thefirst diffuser 140 and thesecond diffuser 180, the difference between the refractive index of air and the diffuser provides good refraction effect to the light travelling between the diffusers. -
FIGS. 14B-14D illustrate some light paths of the light transmitted from the light-emittingdiode chips 120 in thebacklight module 200 of the display device. The light of the light-emittingdiode chips 120 enters thefirst diffuser 140 from the bottom surface of thefirst diffuser 140 and is refracted by the inclined surface of the firstprismatic structure 144 as shown inFIG. 14B . Part of the refracted light is reflected back by the diffusing agents in thesecond diffuser 180, or reflected by the quantum dots in thewavelength conversion film 160 if thesecond diffuser 180 is not implemented, toward thefirst diffuser 140. Part of the reflected light enters thefirst ink structures 154 of thefirst diffuser 140, thefirst ink structures 154 may reflect this part of light back to thesecond diffuser 180, or thewavelength conversion film 160 if thesecond diffuser 180 is not implemented. As such, the light emitted by the light-emittingdiode chips 120 can be diffusely reflected between thefirst diffuser 140 and thesecond diffuser 180, or betweenfirst diffuser 140 and thewavelength conversion film 160, thereby improving the light mixing effect of the backlight module and the brightness uniformity of the displayed images. - Besides
FIG. 14B , part of the light may pass through a portion of theupper surface 142S of thefirst diffuser 140, as shown in Fig, 14C, where thefirst ink structures 154 are not printed on. This part of light passing through thefirst diffuser 140 may enter the secondprismatic structure 184 of thesecond diffuser 180 and be reflected back to thefirst ink structures 154 of thefirst diffuser 140 by the secondprismatic structure 184. Moreover, part of the light may pass thefirst vertex 144A of the firstprismatic structure 144 on thefirst diffuser 140, as shown inFIG. 14D . This part of light may leave the firstprismatic structure 144 and directly enter thesecond ink structures 194, and thesecond ink structures 194 will diffusely reflect this part of light back to thefirst diffuser 140. As such, the light emitted by the light-emittingdiode chips 120 can be diffusely reflected between thefirst diffuser 140 and thesecond diffuser 180, thereby improving the light mixing effect of the backlight module and the brightness uniformity of the displayed images. Moreover, when the display device includes thebacklight module diode chips 120 required in thebacklight module -
FIG. 15A illustrates the brightness uniformity distribution in the backlight module of a prior art display device, andFIG. 15B illustrates the brightness uniformity distribution in thebacklight module 200 of the display device according to some embodiments of the present disclosure. Y-axis inFIGS. 15A and 15B represents normalized uniformity of brightness, and X-axis inFIGS. 15A and 15B represents horizontal or vertical distance in the backlight modules. InFIG. 15A ,curve 301 illustrates the brightness uniformity distribution along horizontal direction in the backlight module of the prior art display device, andcurve 302 illustrates the brightness uniformity distribution along vertical direction in the backlight module of the prior art display device. InFIG. 15B ,curve 303 illustrates the brightness uniformity distribution along horizontal direction in thebacklight module 200 of the display device in some embodiments of the present disclosure, andcurve 304 illustrates the brightness uniformity distribution along vertical direction in thebacklight module 200 of the display device in some embodiments of the present disclosure. The curves inFIG. 15B , which representing the brightness uniformity in thebacklight module 200 of the display device is smoother than the curves inFIG. 15A , which representing the brightness uniformity in the backlight module of the prior art display device. Therefore, the brightness uniformity is improved by the backlight module of the present disclosure and better than the prior arts. - As mentioned above, the backlight module of the display device in some embodiments of the present disclosure has the diffuser with ink structures printed at certain locations. For example, the ink structures of the first diffuser may be printed in the gaps among the first prismatic structure, and the ink structures of the second diffuser may be printed at the locations corresponding to the first vertex of the first prismatic structure. As such, the light emitted from the light-emitting diodes may be scattered and diffusely reflected between the first diffuser and the second diffuser, which can improve the light mixing effect. The brightness uniformity of the backlight module in the display device can thereby be improved. In addition, if the display device has implemented the structures mentioned above, the light-emitting diodes required in the backlight module of the display device can be reduced and the backlight module can still maintain same luminance effect. The manufacturing cost of the display device can thereby be reduced.
- Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims.
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US11782307B2 (en) | 2023-10-10 |
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